Malicious PDF — malware analysis report

Static analysis result for SHA-256 14caebae93022cb6…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ec93dd2cb79d54bbaed439f111c9db0 SHA-1: d0cb5cffd91d1d836eca192be015e1edd5c9586e SHA-256: 14caebae93022cb63d03944f7851da8ea0477dc1627f9bb3ba1bf5d239319bfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=prince2+practitioner+exam+questions+and+answers+pdf+2019 PDF link annotation
    • http://soles2walk.cz/data/file/rudukurunizidu.pdfIn PDF document text
    • https://rcot.org/userfiles/file/2931464858.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4pidlc72asptci6pcuhg99h92v/jisaremujanukaligirifa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d366c54b2---50077277239.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/betedavepimolodubufapo.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d79d1bab0---92862702304.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/jafodojedemadizili.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/88815375156.pdfIn PDF document text
    • http://ud2-140.com/files/16463604544.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa47a5724b6---sanimaben.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d5de4dc81---tejuxibenijowovute.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/rejedofisetewisokuguxibod.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/91f68e6921f5359798449699853432da/kerunimewukegig.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/46991306497.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160815bf9d901f---nezukewitivaxedob.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624926512.pdfIn PDF document text
    • https://aneri12.cz/res/file/81301916338.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/72754700273.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nrloaiibsaj8ujnk78hflmlchu/fewumezakir.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2356b358---lafokizozetukofexepaburuk.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/vakibekilivesuzi.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210530_BB7469D9D2F2FA7C.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 18224 bytes
SHA-256: f489cf749167e4e8d70a4a64a46c329653e5b8ebfe906feb12eea2ecc99d174c
font_02_sfnt_off000124be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BE 11632 bytes
SHA-256: 2a7d5b757a3272a4e80fe152d1916de64c400ebe3fb3459648bcf0e02465ed95